A container garden can be an artistic composition of color, form and movement, pleasing to the senses, a softening of a terrace, deck or patio or showcasing an entryway. Ideally, such a garden in a pot consists of a variety of plants-one or two stretching upward, others spilling gracefully over the rims. Filled with flowers and fascinating foliage, some gardeners even use them as artistic statements directly in garden beds. Many gardeners are discovering that brightly glazed or painted ceramic pots,.spilling over with attractive flowers and foliage, brighten a landscape and serve as sensual focal points. But for success with containers, you need to take a few precautions to ensure healthy plants. Because roots are confined in spaces smaller than landscape beds, it's crucial to make sure the plants won't be stressed by under or over watering, The first requirement is to select the right size container. Trade in the tiny pots for those that provide adequate size for roots and won't dry out quickly. That's the sage advice offered by Evelyn Weidner, founder and owner of Weidner's Gardens in Encinitas, California. Weidner specializes in hanging baskets filled with flowering or foliage plants. A real hands-in-the-dirt gardener, she's been doling out garden advice along with plants for decades.